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Scorpion4ik [409]
3 years ago
13

Neha swims in a 90 m long pool. She covers 180 m in

Physics
1 answer:
mario62 [17]3 years ago
3 0

Answer:

speed in m/s is 3m/s

Explanation:

as she swims 90m in 30 seconds

dividing  90 by 30 will give 3m/s

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A hummingbird flies in circles around a bush. if the velocity of the hummingbird is 720 cm/s and the radius of the circular path
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57,600 cm/s ^2 ...........
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3 years ago
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What percent of $ 40 is $ 32?<br><br>​
kumpel [21]

Answer:

80%

Explanation:

convert fraction ( ratio ) 32/40 answer 80%

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3 years ago
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A particular cylindrical bucket has a height of 36.0 cm, and the radius of its circular cross-section is 15 cm. The bucket is em
Sergeeva-Olga [200]

Answer:

a. 0.000002 m

b. 0.00000182 m

Explanation:

36 cm = 0.36 m

15 cm = 0.15 m

a) We can start by calculating the air-water pressure of the bucket submerged 20m below the water surface:

P = \ro g h = 1000 * 10 * 20 = 200000 Pa

Suppose air is ideal gas, then if the temperature stays the same, the product of its pressure and volume stays the same

P_1V_1 = P_2V_2

Where P1 = 1.105 Pa is the atmospheric pressure, V_1 is the air volume in the bucket on the suface:

V_1 = Ah

As the pressure increases, the air inside the bucket shrinks. But the crossection area stays constant, so only h, the height of air, decreases:

P_1Ah_1 = P_2Ah_2

h_2 = h_1\frac{P_1}{P_2} = 0.36\frac{1.105}{200000} = 0.000002 m

b) If the temperatures changes, we can still reuse the ideal gas equation above:

\frac{P_1Ah_1}{T_1} = \frac{P_2Ah_2}{T_2}

h_2 = h_1\frac{P_1T_2}{P_2T_1} = 0.36\frac{1.105 * 275}{200000*300} =0.00000182 m

3 0
3 years ago
A conservative force on a particle moving along the x axis is given by F = (3x^2-2x)i. Which of the following is a potential tha
ANTONII [103]

pck u

report me if you can

tex]\purple{\rule{45pt}{7pt}}\blue{\rule{45pt}{999999pt}}

5 0
2 years ago
A wheel of radius 30 cm is rotating at a rate of 2.0 revolutions every 0.080 s. (A) through what angle, in radians, does the whe
ioda

You said 2 revolutions every 0.08 seconds

1 revolution = 2pi radians.

A). The 'unit rate' is    (2 rev) x (2pi / 0.08 sec)  = 50pi radians/sec. =

                                                       157.1 radians per sec (rounded)

B). Radius of the wheel = 30 cm
     Circumference = 2pi R = 60pi cm = 188.5 cm (rounded)

     Rotation speed = 2 revs per 0.08 sec
     Linear speed =    2 x 60pi cm per 0.08 sec

                               (120pi cm) / (0.08 sec) = 47.12 meters per sec

C). Frequency = (revs) per second

                        = (2) / (0.08 sec) = 25 per second .   

7 0
3 years ago
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